Nitrating apparatus



7 cs. JUER NITRATING APPARATUS March 4, 1924.- v 1,485,507

Filed Jan. 21 1922 Patented Mar. 4, 1924.-

- UNITED STATES PA GEORGE JU ER, OF HOPEWELL, VIRGINIA, ASSIGNOE' TO TUBIZE ARTIFICIAL SILK COMPANY OF AMERICA, OF WIIMDI GTON, DELAWARE, A CORPORATION OF DELA- WARE.

NITRATING APPARATUS.

Application filed Ia nuary 21, 1922. 4 Serial No. 580,788.

To all whom it may concern:

Be it known that I, Gnonen J mm, recently a subject of the former Austro-Hungarian Empire, andfnow a residentpf Hopewell, in the county of Prince George, in the State of Virginia, have invented certain new and useful Improvementsv in Nitrating Apparatus, of which the following isa true and exact description, reference being had to the accompanying drawing, which forms a part'thereof.

My invention relates to nitrating apparatus suitable for use in the treatment of cotton to convert it into nitro-oellulose. The object of my invention is to provide a simple, compact and comparatively inexpensive and thoroughly efiicient mechanism for carrying on the nitrating operation, and the leading feature .of my invention consists in combining with a nitrating pot an apparatus of ordinary'construction, a cylindrical receiver rotatable at will and provided internally with a spirally twisted plate secured to its inner wall so as to serve as a conve er for the material delivered to the cylin er and also acting to separate the lower portion of. the cylinder into a series of chambers, each of a capacity suificient to hold and keep separate the entire charge of the mixing ot.

In operation it is my intention that the receiving cylinder is given one complete movement of rotation after each charge of the" mixing pot is dumped into it so that, the charges will be moved progressively and intermittently through the cylinder, the.

length of the c linder being such as to insure that each 0 arge will remain in the cylinder for a sufli'cient period to insure the complete nitration ofthe cotton. Operated in this way each .charge from the mixing pot is not only kept entirely separate from each other charge but is in the cylinder intermittently tumbled-as the cylinder is given a motion of rotation. This tumbling and the simultaneous longitudinal movement given to the charge by the helical walls of the containing chamber effectin a most desirable mixing of the cotton an acid and of the diiferent layers of acid with the least possible tearing or disintegrating action on the fibres of the cotton.

My invention and its details will be best understood and described in connection with the drawing in which it is illustrated and which is an elevation forthe most part in plrovided with a feeding device indicated at 'B' indicates the elivei'y end of the hopper opening as shown 'into a hood D Y.

which extends over the top of the mixin pot. through which the s aft of the mixin- .device extends. D is an opening in the 00d throu h which an acid pipe is introduced into t a hood and D is a pipe or conduit leading from the hood and connected with a fan, not'shown, for drawing off the acid fumes which rise in the hood from the mixing potr E indicates the housing for the mixinlgapparatus, E indicating a driving shaft w ich, as shown, isconnected by a mitre wheel E and the mitre wheel E with the shaft E which through 'a mitre gear E drives amitre gear E from which extends a shaft E connected so as to rotate with the gear E but free to move u and down in'it, the lower part of this sha being threaded as indicated at E and the threaded portion of the shaft being engaged with a threaded portion E of the housing E. E indicates the mixin wheel supported at the bottom of the sha t E". This art of the apparatus is not new with me an is not shown in detail. It will be understood that the shaft E is rotated alternately in op osite directions pot acting to mix the cotton thoroughly with the acid.

F is a,measurin tank for the acid from .which leads a pipe for delivering the acid into the mixing pot, F indicating a cap, for opening and c osing this pipe. is a lat- D is an opening in the top of the hoo too form on which are supported the stan ards I G which support'the trunnions H ofthe mixin t indicated at H. I is a hopper secure -1n the end of the cylinder J and openin into the cylinder through itslower end in icated at I, I is a closure for the hopper which is opened when the charge is being dumped into it from the mixing pot and which should remain closed during the rotating movement of the cylinder; J is the c linder to the inner wall of which is secured t e helically bent plate indicated at J.

The depth and pitch of this helix should be such as will divide the lower portion of the cylinder into a series of containing chambers indicated in the drawing by the numerals from 1 to 12 and each of such dimen sion as to hold and kee separate acharge at the rear end of the cylinder. J. and J are circular rin or bearings secured to the cylinder J and t ough which it is supported on rollers indicated at J and J J is an annular rack or gear wheel secured to the cylinder J and enga ed with the pinion J on a shaft J to w 'ch, as shown, are secured fast and loose pulleys J and J.

K is a delivery conduit with whichthe delivery end J of the cylinder connects as shown and which leads into a centrifugal wringer indicated atL and which ma be.

of ordinarily used construction from w ich vthe dried nitrate of cotton is delivered into a storage chamber M. N is a conduit leading from the upper end of the delivery conduit K to a fan indicated at N, from which leads an outlet conduit N".

In operation a measured charge of acid is delivered into the mixing pot Hand a measured charge of cotton is dumped into the hopper B. The feeding, device C and mixing evice E are then set in operation, the cotton being fed with uniform determined speed into the mixing pot and the mixer E in its downward movement reseing the cotton which has passed the de 'very end B of the hopper down into the mixing pot H and thoroughly stirring it into the acid. When the full charge of cotton has been delivered into the mixing pot and thoroutghly mixed with the acid therein the cylin er J broug to the position shown in the h drawing with ifs hopper I in proper position I to recelve the charge from the mlxmg pot has the contents of the mixing pot dumped into it, the charge occupyin the divisional chamber indicated at 1 an thereafter the cylinder J is rotated through one complete revolution so that the char e just dum ed into it will occupy the cham er indicate at 2. A new charge of acid and cotton is then mixed in the mixing pot and dumped into the chamber 1 of the cylinder J and so on.

The number of chambers into which the c linder J is divided by the spirally twisted p ate is such as to insure that each charge progressively delivered to the cylinder and progressively moved along the length of the cylinder should i in the cylinder for sufiicient length of time to insure its coniglete nitration so that'when the charges are elivered from the end chamber 12 into the outlet passage J a and through the conduit K into the wr1n er L nitration will be completely eflecte It will be obvious that my mechanism is such that a single mixing pot and mixing apparatus can be kept in ractically continuous operation to thoroug ly mix the cotton and acid together and begin the nitrating operation while the greater part of the operation of nitration goes on in the mixing cylinder which keeps the charges from the mixing pot separated fromeach other and retains each charge for a suflicient length of time to insure the complete nitration of the cotton before delivering it to the drying'apparatusi. a

The leading ofi' of fumes from the-hood over the m'izpng pot' and from the conduit K is a detail of practical im ortance enabling my'apparatus to be use without exposingrthe workmen to the acidwfumes which arise om the pot and. cylinder. Having now descri ed my invention, what I claim as new and desire to secure by Letters Patent, is:

combination a mixing pot, a rotatable nitrating cylinder havinga charging opening g 1. A nitratingapparatus comprising in I inder a multiple series of receptacles separated from each other by the lower portions of the spiral plate and each of greater capacity than the pot and all} connected in series by the upper spaces between convolutions of the s iral plate, and means for rotating the cylin er.

2. A nitrating apparatus comprising a hood for a mixing 0t, and a mlxing pot sup orted below sai hood, a hop er for the purified cotton openi into sai hood and aving a feeding whee means for dippin and agitating the cotton working in the hoo a rotatable cylinder arranged to receive in its front end a charge from the pot, a spirally twisted plate secured on the inside of the cylinder, said plate having such pitch and height as to form with the walls of the cylinder and along the bottom of the cylinder a multiple series of receptacles separated from each other by the lower portions of the spiral plate andeach of geater capacity than the pot and all connected in series by the spaces between the upper convolutions of the s iral plate and means for rotating the .cylin er.

3. A nitrating apparatus comprising a hood for a mixlngdpot, and a mlxing pot suppo below sax hood, a hopper for the purified cotton opening into said hood and having a feeding wheel, means for dipping and agitating the cotton working in the hood, a rotatable cylinder arranged to re- 5 ceive in its front end a charge from the pot,

a spirally twisted plate secured on the inside of thecylinder, said plate having such pitch and height as to form with the walls of the cylinder and along the bottom ofthe cylinder a multiple seriesof receptacles separated from each other by the lower portions of the spiral plate and each of greater capacity than the pot and all connected in series by the s aces between the upper convolutions of 5X6 spiral plate, means for carryin off fumes from the pot and delivery conduit and means for-rotating the cylinder.

' GEORGE JUER. 

